The names of the twins, Annie and Hallie, are also the names of the daughters of the writers/producers of the show, Nancy Meyers and Charles Shyer. Also, the REAL Annie and Hallie appear in the movie -- one as a girl at camp named Lindsay, and one as... more

During the hotel scene, one of the twins is talking to someone, then walks away through a door. As she is walking away, she sings quietly to herself "let's get together, yea yea yea..." which the twins sang together at camp in the original Parent Trap.